Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz....
We found this white noise generator circuit in old European documentation, but the components used...
We found this 1 A switching regulator in an Electronics Now magazine from April 1993. The...